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Oryctocephalus
Taxonomy
Oryctocephalus was named by Walcott (1886) [Sepkoski's age data: Cm Boto-l Cm mMid-u Sepkoski's reference number: 80,474]. Its type is Oryctocephalus primus. It is the type genus of Oryctocephalinae.
It was assigned to Corynexochida by Sepkoski (2002); to Oryctocephalidae by Palmer (1954), Palmer and Halley (1979) and Jell and Adrain (2002); and to Oryctocephalinae by Sundberg and McCollum (1997) and Sundberg and McCollum (2003).
It was assigned to Corynexochida by Sepkoski (2002); to Oryctocephalidae by Palmer (1954), Palmer and Halley (1979) and Jell and Adrain (2002); and to Oryctocephalinae by Sundberg and McCollum (1997) and Sundberg and McCollum (2003).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1886 | Oryctocephalus Walcott |
| 1954 | Oryctocephalus Palmer p. 68 |
| 1979 | Oryctocephalus Palmer and Halley p. 84 |
| 1997 | Oryctocephalus Sundberg and McCollum p. 1071 |
| 2002 | Oryctocephalus Jell and Adrain p. 415 |
| 2002 | Oryctocephalus Sepkoski |
| 2003 | Oryctocephalus Sundberg and McCollum p. 345 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Oryctocephalus Walcott 1886
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†Oryctocephalus americanus Sundberg and McCollum 2003
†Oryctocephalus elongatus Zhao et al. 1997
†Oryctocephalus incurvus Lu and Chien 1974
†Oryctocephalus indicus Reed 1910
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Invalid names: Oryctocephalus kobayashii Saito 1934 [objective synonym]
†Oryctocephalus lancastrioides Shergold 1969
†Oryctocephalus maladensis Resser 1939
†Oryctocephalus nyensis Palmer and Halley 1979
†Oryctocephalus orientalis Saito 1934
†Oryctocephalus primus Walcott 1886
†Oryctocephalus reticulatus Lermontova 1940
†Oryctocephalus reynoldsiformis Lermontova 1940
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. R. Palmer 1954 | Cranidium with glabella prominent, nearly parallel sided, extended to border. Glabellar furrows marked by three pairs of pits often connected by shallow furrows across top of glabella but not con- nected to dorsal furrow. Occipital furrow distinct,
.with deep pits near dorsal furrow. Brim not present in front of glabella. Border flat, short. Width of fixed cheek one-half or more width of glabella. Palpe- bral lobe moderately large, opposite middle third of glabella, connected to dorsal furrow by distinctly to poorly defined ocular ridge. Facial suture straight for- ward in front of palpebral lobe, divergent behind. Free cheek narrow, margin evenly rounded. Border well defined by marginal furrow, extended posteriorly into genal spine. Thora,x of 6 or 7 segments. Axial lobe prominent, width greater than one-half width of pleural lobes. Pleural lobe of each segment with deep diagonal pleural furrow; distal spines of variable length. Pygidium subsemicircular in outline, consisting of 5 segments and a small terminal portion. All segments visible on axial and pleural lobes; pleural furrows deeper than interpleural grooves. Each segment extended distally into a marginal spine. |